Malachite - Peacock stone

Japanese: クジャク石(孔雀石) - くじゃくいし

Malachite is also called malachite. Its chemical composition is Cu ₂ (OH) ₂ CO ₃ , and it is a monoclinic mineral that occurs in the upper oxidized zone or secondary rich zone of copper deposits. It is used for decoration, as a pigment, and as a raw material for fireworks. Large crystals are rare, and it forms delicate needle-like, but most are clumpy or crust-like, radial aggregates. It is brittle. Mohs hardness 3.5-4, specific gravity 3.9-4.05, twin plane (100). Cleavage is complete on {01} and clear on {010}. It is translucent to opaque, bright green, and the crystals have a glassy luster rather than a diamond luster, and the aggregates have a silky or velvety luster, and are often matte or earthy luster.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

マラカイトmalachiteともいう。化学成分Cu₂(OH)₂CO₃，単斜晶系に属する鉱物で，銅鉱床の上部酸化帯または二次富鉱帯に産する。装飾用，顔料，また花火の原料として使われる。大きい結晶はまれで，繊細な針状，多くは塊状または皮殻状，放射状の集合体をなす。もろい。モース硬度3.5～4，比重3.9～4.05，双晶面(100)。へき開は｛01｝に完全，｛010｝に明確。半透明ないし不透明，輝緑色，結晶はダイヤモンド光沢よりややガラス光沢に近く，集合体は絹糸光沢，ベルベット状光沢をもち，しばしば無艶または土状光沢。

出典　株式会社平凡社世界大百科事典第２版について　情報

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